Electric heating device and method of constructing the same.



H. B. TAYLOR. ELECTRIC HEATING DEVICE AND METHOD OF GONSTRUGTING THESAME. APPLICATION FILED DEC. 31, 1908.

1,005,360. Patented 0ct.10,191'1.

"u H n H n n UNITED STATES, PATENT OFFICE.

TAYLOR, OI WILKINSBUBG," PENNSYLVANIA, ASSIGNOR T0 WESTINGHOUSE ELECTRIC6: MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA ELECTRIC HEATINGDEVICE AND METHOD CONSTRUCTING THE SAME.

To all whom it mag concern.-

Be it known that I, HAROLD B. Ternon, a citizen of'the United States,and a resident of Wilkinsburg, in the county of Allegheny and State ofPennsylvania; me invented a new and useful Improvement ni ElectricHeating Devices and Methods of Construct ing the Same, of which thefollowing-is a specification.

My invention relates to electric heaters and it has forit's object toprovidev a simple. and eflicient heater which may be utilized forvarious purposes and a novel method of constructing the same whereby arelatively high prewure'may be exerted on the resist ance element andits insulating sheath when relatively thin metal plates or'punchingsconstitute the outer shell or covering of the device. I 7

According to my present invention, I dispose a suitable resistanceelement between flat plates of insulating material andassemble thestructure thus formed between parallel plates of relatively thin sheetmetal.

The ends of the plates are then securely riveted together and a highpressure is brought tb bear upon the resistance element and theinsulation by finally bending the plates of conducting material intosuch form that one of'the plates is-subject to tensional strains, andthe other to strains in compression. b

Figure 1 of the accompanying drawings is a sectional plan view'of anelectric heating device constructed in accordance with my invention,Fig. 2 is a sectional elevation of the structure in process ofconstruction and Fig. 3 is a similar view of the completed device. 1 4 Vferring to the drawings, a resistance element 1, preferably in ribbonform, is disposed as a zig zag grid between plates 2 of mica or otherheat-resisting insulation,

. the flat-element thus formed being assembled between a pair ofrelatively thin metal plates 3. A single plate3, folded on itself, asshown in Figs. 2 and 3, may, of'course, be employed in lieu of twodistinct plates.

If it is desired to produce a curved heater or a heater of cylindricalform, the ends of the plates are riveted together, as shown in Fig. 2.The plates are then bent into the final form, as shown in Fig. 3, thebending process being relied upon to produce a high pecification otmtersP n Patented Oct. 10, 1911. Application filed December 31, 1908.

Serial No. 470,272

pressure between the plates. anu. to force the parts into closeengagement with each other,as this relation is essential to a successfuland eflicient heater.

It will,of course, be understood that, if,

bent .as to have a corrugated, or waved surface in order to obtain thedesired pressure between the outer surfaces.

Since the form of the resistance element and the size and arrangement ofthe parts of which the heater is composed may be varied withoutdeparting from the spirit of my invention, I desire that only suchlimitations shall be imposed as are indicated in the appended claims.

I claim as myinvention:

1. An electric heater comprising a resistance element, insulating sheetsor strips be-. tween which said element is located and relatively thininclosing metal plates firmly secured together and bent to exertpressure upon the inclosed insulated resistance element. I

2. An electric heater comprising an insulatedresistance element andinclosing metal plates one of which is maintained under tension and theother under compression to exert pressure upon said resistance element.

3. An electric heater comprising a zig zag ribbon resistance element,insulating sheets or-strips therefor and inclosing metal plates havingcorresponding edges rigidly secured together, said structure being bentto produce a high pressure upon the parts between' the metal plates.

4. An electric heater comprising a zig zag resistance ribbon, sheets orstrips of insulating material, and thin metal plates which aremaintained under tension and compression, respectively, to clamp theresistance ribbon and the insulating material between them.

K g V 1,0055% 5. An electric heater comprising sheets or In testimonywhereof, I have hereunto strips of insulating material, a resistancesubscribed my name this 12th day of Deribbon between said sheets orstrips and thin cember, 1908." metal plates, one of which is maintainedOLD B. TAYLDR.

5 under tension and the other under compres- Witnesses:

sion in order to clamp the resistance and in- DUDLEY 'A. BOWEN, sulationelements between them. BIRNEY Hmns.

